$(function(){
			var $window, $tBody, $formBlock;
			$window = $(window);
			$tBody = $('div#truebody');
			$formBlock = $('div#formBlock');
			function update(){
				var windowHeight = $window.height();
				var formHeight = $formBlock.offset().top;
				$tBody.height(windowHeight-formHeight);
			}
			update();
			$(window).on('resize',update);
		});